These generated artifacts are deployment descriptors and helper classes.
Image descriptors are lightweight descriptions of an image; they don't have any GDI associated with them.
These descriptors will be automatically updated or generated by the server during the deployment.
While it is theoretically possible to generate the required extended deployment descriptors manually, it is impractical to do so.
There's no need to print error messages for this case since file descriptors 0 through 2 are only closed if an attacker is trying to subvert your program.
EJB 3.0 supports partial XML deployment descriptors where you can define interceptor bindings that externalize matching an interceptor to a class.
